JPH0746028A - Antenna device and transponder including the device - Google Patents

Abstract

PURPOSE:To provide the an antenna device of the horizontally polarized wave of non-directivity in a horizontal face which can be made compact and simply constituted by exiting radiation slots provided at the opposed vertical faces of rectangular parallelipiped ground conductive boards in which a dielectric is packed with mutually opposite phases. CONSTITUTION:A radio wave propagated through a coaxial line 8 is transmitted through a coaxial connecter 7 to a triplate line 6. A dielectric 4 is inserted into ground conductive boards 2, a line 6 is constituted small, and an antenna is made compact. The terminations of the line 6 are connected with the side walls of the radiation slots 1, and a voltage is impressed between stripe conductors 5 and the ground conductive boards 2. The terminals of the line 6 are oppositely connected with the side walls of the slots 1, so that electric fields in a cavity constituted of conductors 3 connecting the ground conductors 2 can be opposite. Therefore, the slots 1 provided on the ground conductors 2 are exited with the opposite phases, and a radiation fields from the slots 1 are made continuous in the horizontal face. Thus, the radiative pattern of the non-directivity of the horizontally polarized wave can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an omnidirectional horizontal polarization antenna device in a horizontal plane and a transponder equipped with the antenna device.

[0002]

2. Description of the Related Art Heretofore, as an antenna device of this type, for example, there is one shown in Uchida, Mushiaki: "Ultra Short Wave Antenna", Production Technology Center, Chapter 12 (March 1977).
25A and 25B are schematic configuration diagrams showing an omnidirectional horizontal polarization antenna device in the horizontal plane, in which FIG. 25A is a perspective view and FIG. In the figure, 31 is a dipole antenna.

Next, the operation will be described. The ground conductor is composed of four surfaces, and the dipole antenna is arranged on each surface. The horizontally polarized wave is excited by arranging the dipole antenna parallel to the horizontal plane. A plurality of dipole antennas are arranged on the vertical plane. The amplitudes of the currents flowing through the dipole antennas provided on the four surfaces and having the same height are made equal, and the phases are sequentially changed by 90 degrees. The radiation directivity of one element of the dipole antenna is an 8-character directivity, but by combining four elements, almost non-directionality of horizontal polarization can be obtained.

As another conventional example, for example, T.W. Ta
keshima: "X-bandomnidirect
ional double-slot array a
ntenna ”, ELECTRONIC ENGINE
ERING, No. 39, pp. 617-621 (Oc
t. 1967). 26A and 26B are schematic configuration diagrams showing a horizontal polarization omnidirectional antenna device (rectangular waveguide slot antenna) of horizontal polarization, where (a) is a perspective view, (b) is an AA cross-sectional view, and (c). Is a side view. In the figure, 1 is a radiation slot, 21 is a waveguide, and 18 is a flange.

Next, the operation will be described. 27A and 27B are diagrams for explaining the operation principle of the rectangular waveguide slot antenna. FIG. 27A shows a magnetic field distribution inside the waveguide, and FIG. 27B shows a magnetic field inside the waveguide along the AA cross section. The current distribution flowing on the side surface is shown. By shorting the end of the waveguide,
The magnetic field and the current distribution as shown in FIGS. The radio wave propagating through the rectangular waveguide 21 is excited at the position offset from the center of the H-plane of the rectangular waveguide 21 along the tube axis to excite the radiation slot and radiate the radio wave. It In this case, the radiation slot is excited by providing the radiation slot at a position where the magnetic field of the waveguide is maximum, and the radiation amount is adjusted by changing the position of the radiation slot.

In order to make the above waveguide slot antenna a horizontally polarized omnidirectional antenna, radiation slots are provided on the front and back sides of the H surface of the waveguide as shown in FIG. 28 (a). The magnetic field and the current distribution are as shown, the radiation slots are excited in opposite phases as shown in FIG. 28B, the radiation field becomes continuous in the horizontal plane, and omnidirectionality can be obtained. However, let us consider a case where the radiation slot is composed of two elements as shown in FIG. 27A (radiation slots are provided at symmetrical positions on the back surface). Two radiation slots can be excited in the same phase by placing the radiation slots at positions symmetrical with respect to the center with the radiation slot interval between the two elements set to λg / 2 (λg is a guide wavelength). Therefore, although a vertically symmetrical pattern can be obtained in the front direction (φ = ± 90 °), in the case of φ = 0 ° and 180 °, due to the array factor of the radiation field of the radiation slot of two elements, in the case of FIG. 28, θ = 9
Beam tilt occurs in the 0 ° + α direction. Therefore, x-
On the y-plane, a gain difference occurs in the directions of φ = ± 90 ° and 0 °, 180 °, the ripple in the horizontal plane becomes large, and omnidirectionality cannot be obtained. Even if the radiation slot is a single element, the radiation slot is offset from the center of the H-plane of the waveguide, so that the structure does not become symmetrical and no omnidirectionality is obtained.

FIG. 29 is a schematic diagram showing a conventional transponder. It is equipped with a horizontal polarization antenna device and a transceiver that are omnidirectional in the horizontal plane, and when an emergency such as a disaster occurs, it is activated by turning on the switch and is in a radio wave standby state. In this state, once the radar signal emitted by the searcher is received, the state is switched to the state of emitting radio waves and the response radio waves are transmitted. By emitting this radio wave, the location of the emergency signal sender is notified and the searcher is rescued.

[0008]

The conventional omnidirectional antenna in the horizontal plane is constructed as described above, and is widely used as an antenna device for TV or radar. However, in the case of the dipole antenna, there are problems that the structure is three-dimensional, it is difficult to fix the antenna, the volume of the antenna becomes large, or it is difficult to wire the feeder line. Further, in the case of a waveguide slot antenna, it is possible to easily obtain characteristics close to omnidirectionality by providing a radiating slot in the waveguide, but if ripples in the horizontal plane become large, omnidirectionality cannot be obtained. There was an issue. Also,
The conventional transponder has the following practical problems. First, it is necessary to turn on the switch to put it in a standby state for radio waves, but sometimes it is forgotten to turn on the switch because it is an emergency. In this case, it does not function as a transponder, which is life-threatening. In addition, although it transmits when the radar signal emitted by the search machine is received, it is not clear in which state it is. Even if the switch was turned on, there was a problem that the transmitter / receiver might be broken and it was not possible to know that transmission was being performed. Further, there is a problem that the state in which the search machine is approaching cannot be known even when transmitting.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a small-sized and simple structure omnidirectional antenna device in a horizontal plane of horizontal polarization. . In addition, it is equipped with an omnidirectional horizontal polarization antenna in the horizontal plane, and this unit is activated and is in a standby state for reception, in a transmitting state, and in a state where a searcher is approaching. The purpose is to obtain a transponder that can inform the caller of an emergency signal.

[0010]

In order to achieve the above object, the invention according to claim 1 provides a radiation slot in a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape,
An antenna device having a feed line for feeding the radiation slot, wherein the inside of the rectangular parallelepiped ground conductor plate is filled with a dielectric material, and the radiation slots provided perpendicularly to both ground conductor plates have opposite phases. It is designed to be powered by.

The invention according to claim 2 is the invention according to claim 1.
In the antenna device described above, a dielectric material is hollowed out only between the radiation slots provided in the ground conductor plates on the specific facing vertical planes.

According to a third aspect of the present invention, there is provided an antenna device comprising a ground conductor plate forming a rectangular parallelepiped, a radiation slot provided on a specific facing vertical surface, and a feed line for feeding the radiation slot. The power feeding lines electromagnetically coupled to the radiation slots provided perpendicularly to the two ground conductor plates feed power in opposite phases.

According to a fourth aspect of the present invention, there is provided an antenna device comprising a ground conductor plate forming a rectangular parallelepiped, a radiation slot provided on a specific facing vertical surface, and a feed line for feeding the radiation slot. A plurality of radiating slots arranged in a line perpendicular to the two ground conductor plates, the radiating slots provided in the two ground conductor plates are fed in opposite phases to each other, and adjacent radiating slots on the same ground conductor plate are provided. The power supply line length difference for supplying power is set to an integral multiple of the wavelength, and power is supplied in the same phase.

According to a fifth aspect of the present invention, there is provided an antenna device including a radiation slot provided on a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feeder line feeding the radiation slot. A plurality of radiating slots arranged in a line perpendicular to the two ground conductor plates, the radiating slots provided in the two ground conductor plates are fed in opposite phases to each other, and adjacent radiating slots on the same ground conductor plate are provided. In this configuration, the difference between the lengths of the feed lines for feeding the is set to an odd multiple of a half wavelength, and the power is fed in the same phase.

The invention according to claim 6 is the same as claim 1.
7. A pin for connecting between the facing ground conductor plates is provided in the vicinity of a radiation slot provided on a specific facing vertical surface of the ground conductor plate forming the rectangular parallelepiped shape of the antenna device according to claim 5. Is.

The invention according to claim 7 is the same as claim 1.
4. An antenna device comprising: a radiating slot provided on a specific opposing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape of the antenna device according to claim 3; and an antenna device having a feed line for feeding the radiating slot. A trumpet-shaped conductor that spreads at a required taper angle is attached to the upper end and the lower end of the antenna device.

The invention according to claim 8 relates to claim 1.
7. The antenna device according to claim 6, wherein a radiation slot is provided on specific opposing vertical surfaces of the ground conductor plate forming the rectangular parallelepiped shape of the antenna device, and the antenna device is provided with a feed line for feeding the radiation slot. On the outside of both vertical planes without the radiation slot of the antenna device, ground conductor plates forming a semi-cylindrical shape are attached respectively, and the influence of the diffracted wave at the end of the ground conductor plate provided with the radiation slot is reduced. is there.

According to a ninth aspect of the present invention, a radiation slot parallel to the axis is formed in the conductor wall of the cylindrical conductor having a short-circuited termination.
An antenna device for feeding the radiation slot by exciting the cylindrical conductor by providing a conductor rod extending from the sidewall of the radiation slot to the inside of the rectangular waveguide. A trumpet-shaped conductor that spreads with a required taper angle is attached to both ends of the conductor.

According to a tenth aspect of the present invention, one or a plurality of radial slots parallel to the axis are provided in the conductor wall of a cylindrical conductor having a short-circuited terminal end having a central conductor, and a square is formed from the side wall of the radial slot. An antenna device which is provided with a conductor rod directed to the inside of a waveguide and which excites the cylindrical conductor to feed the radiation slot, and has a trumpet-like shape that spreads at both end portions of the cylindrical conductor with a required taper angle. A conductor is attached.

According to the eleventh aspect of the present invention, one or a plurality of radiation slots parallel to the axis are provided in the conductor wall of the cylindrical conductor having a short-circuited termination, and the cylindrical conductor is excited to excite the above. An antenna device for feeding a radiation slot, wherein the cylindrical conductor is dimensioned to be excited in a TE ₀₁ mode.

According to a twelfth aspect of the present invention, there is provided an antenna device in which a radiating slot is provided in a conductor wall of a rectangular waveguide having a short-circuited terminal, and the rectangular waveguide is excited to feed the radiating slot. A plurality of radiation slots parallel to the tube axis are provided on the centerlines of both H surfaces of the waveguide, and conductor rods extending from the sidewalls of the radiation slots toward the inside of the rectangular waveguide are provided.

According to a thirteenth aspect of the present invention, there is provided an antenna device in which a radiating slot is provided in a conductor wall of a rectangular waveguide having a short-circuited termination, and the rectangular waveguide is excited to feed the radiating slot. A plurality of radiation slots parallel to the tube axis are provided on the center lines of both H surfaces of the waveguide, and a dielectric is provided inside the rectangular waveguide at a position asymmetric with respect to the tube axis.

According to a fourteenth aspect of the present invention, there is provided an antenna device in which a radiating slot is provided in a conductor wall of a rectangular waveguide having a short-circuited termination, and the rectangular waveguide is excited to feed the radiating slot. A plurality of radiation slots parallel to the tube axis are provided on the center lines of both H surfaces of the waveguide, and the rectangular waveguide is dimensioned to be excited in the TE ₂₀ mode.

According to a fifteenth aspect of the present invention, a plurality of radial slots parallel to the axis are provided in the circumferential direction on the conductor wall of a cylindrical conductor having a short-circuited terminating end having a central conductor therein. In the antenna device, which is excited to feed the radiation slot, the center conductor has a spiral shape or a loop shape.

According to the sixteenth aspect of the present invention, a pair of microstrip antennas having one-sided short-circuit patch conductors on the ground conductor plate are symmetrically oriented parallel to each other on the ground conductor plate surface sides, and then one of the microstrip antennas is turned on. The strip antenna is set at a position rotated by 180 degrees while maintaining the direction of the ground conductor plate surface, and the two one-sided short-circuit patch conductors are fed in opposite phases to each other.

According to a seventeenth aspect of the present invention, both ends of the ground conductor plate are bent in mutually opposite directions, the tips of the respective bent portions are further folded back, and the folded portions are used as one-side short-circuit patch conductors. The patch conductors are fed in opposite phases to each other.

According to the eighteenth aspect of the present invention, the antenna device of the sixteenth aspect is provided with a non-feeding conductor having the same shape as the one-sided short-circuited patch conductor symmetrically facing the one-sided short-circuited patch conductor on the ground conductor plate. It is a thing.

In the invention according to claim 19, the center point of the ground conductor plate of the microstrip antenna having the one-side short-circuit patch conductor on the ground conductor plate is the center of symmetry, and the other one-side short-circuit patch conductor is the ground conductor. As a feed line that feeds the above two patch conductors, provided at symmetrical positions on the back surface of the plate,
The inner conductor of the power feed line is connected to the ground conductor plate, the outer conductor of the power feed line is divided into two and connected to the two patch conductors, respectively, so that power is fed in opposite phases to each other.

The invention according to claim 20 is a radome for protecting the antenna device according to any one of claims 1 to 19, wherein a conductor film is attached to the inside of the radome,
A plurality of radiation slots oriented in the vertical direction are provided in the circumferential direction.

The invention according to claim 21 includes the antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, a transceiver, and a switch for enabling reception. In addition, it is a transponder that receives and transmits radio waves, and is provided with means for notifying an emergency signal sender that the transponder is activated and is in a reception waiting state.

The invention according to claim 22 has the antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, and a transceiver, and receives and transmits radio waves. And a means for notifying an emergency signal sender that the transponder is in the activated and transmitting state.

The invention according to claim 23 is an antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, a transceiver, and a transponder for receiving and transmitting radio waves. There is provided means for notifying the emergency signal sender of the level at which the transponder received the radio wave.

[0033]

In the invention according to claim 1 configured as described above, a radiation slot is provided on a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feed line for feeding the radiation slot is provided. The inside of the rectangular parallelepiped ground conductor plate of the antenna device is filled with a dielectric, and the radiation slots provided perpendicularly to the ground conductor plates are fed in opposite phases to each other, so that the radiation field from both radiation slots is It becomes continuous in the horizontal plane (azimuth direction), and it is possible to obtain an omnidirectional radiation pattern in the horizontal plane by horizontal polarization, and to reduce the size by the wavelength shortening effect of the dielectric.

Further, in the invention according to claim 2, the dielectric material is hollowed out only at a portion between the radiation slots provided on the ground conductor plates of the specific facing vertical surfaces of the antenna device according to claim 1, and the antenna device resonates at the same resonance frequency. By making the long side of the radiation slot longer for this purpose, in addition to the action of the antenna device according to the first aspect, the beam is narrowed, the gain in the front direction is increased, and the gain in the horizontal plane can be increased.

According to the third aspect of the present invention, a radiation slot is provided on a specific opposing vertical surface of the ground conductor plate forming a rectangular parallelepiped shape, and both of the above antenna devices having a feed line for feeding the radiation slot are provided. The structure is simple by feeding power in opposite phases from the feed line that electromagnetically couples the radiation slot provided perpendicular to the ground conductor plate, and the radiated electric field from the radiation slot becomes continuous in the horizontal plane, A non-directional radiation pattern can be obtained with.

Further, in the invention according to claim 4, a radiation slot is provided on a specific facing vertical surface of the ground conductor plate forming a rectangular parallelepiped shape, and both of the above antenna devices having a feed line for feeding the radiation slot are provided. A plurality of radiating slots are provided in a line vertically to the ground conductor plate, the radiating slots provided on the two ground conductor plates are fed in opposite phases to each other, and the adjacent radiating slots on the same ground conductor plate are fed. By feeding the power in the same phase with the difference in the length of the feed line as an integral multiple of the wavelength, the radiated electric field from the radiating slot becomes continuous in the horizontal plane, and an omnidirectional radiation pattern can be obtained in the horizontal plane, and the vertical plane The beam inside is narrowed down and high gain characteristics can be obtained in the horizontal plane.

Further, in the invention according to claim 5, a radiation slot is provided on a specific facing vertical surface of the ground conductor plate forming a rectangular parallelepiped shape, and both of the above antenna devices are provided with a feeding line for feeding the radiation slot. A plurality of radiating slots are provided in a line vertically to the ground conductor plate, the radiating slots provided on the two ground conductor plates are fed in opposite phases to each other, and the adjacent radiating slots on the same ground conductor plate are fed. By feeding the power in the same phase with the difference in the length of the feed line being an odd multiple of half the wavelength, the radiated electric field from the radiation slot becomes continuous in the horizontal plane, and a non-directional radiation pattern can be obtained in the horizontal plane, and the vertical The in-plane beam can be narrowed and a high gain characteristic can be obtained in the horizontal plane.

Further, in the invention according to claim 6, in the vicinity of the radiation slot provided on a specific facing vertical surface of the ground conductor plate forming the rectangular parallelepiped shape of the antenna device according to any one of claims 1 to 5. By providing the pins for connecting the ground conductor plates facing each other, in addition to the function of the antenna device described above, unnecessary waveguide mode excitation is suppressed, and high-gain omnidirectional radiation in a horizontal plane is provided. You can get the pattern.

In the invention according to claim 7, a trumpet-shaped conductor that spreads with a required taper angle is attached to the upper end and the lower end of the antenna device according to any one of claims 1 to 3. In addition to the operation of the antenna device described above, the beam width in the vertical plane can be narrowed by changing the taper angle of the trumpet-shaped conductor without changing the size or position of the radiation slot, and the height in the horizontal plane can be increased. A gain omnidirectional radiation pattern can be obtained.

Further, in the invention according to claim 8, ground conductor plates forming a semi-cylindrical shape are respectively provided on the outer sides of both vertical surfaces having no radiation slot of the antenna device according to any one of claims 1 to 6. By adding, by reducing the influence of the diffracted wave of the ground conductor plate end portion provided with a radiation slot, in addition to the action of the antenna device described above, the size of the slot,
The magnitude of the ripple in the horizontal plane can be adjusted without changing the position, and an omnidirectional radiation pattern can be obtained.

Further, in the invention according to claim 9, one or a plurality of radiation slots parallel to the axis are provided in the conductor wall of the cylindrical conductor of which the terminal is short-circuited, and the rectangular waveguide is provided from the side wall of the radiation slot. By providing a conductor rod toward the inside of the antenna device, by attaching a trumpet-shaped conductor that spreads with a required taper angle to both ends of the cylindrical conductor of the antenna device that excites the cylindrical conductor to feed the radiation slot. ,
The beam width in the vertical plane can be narrowed by changing the taper angle of the trumpet-shaped conductor without changing the size and position of the radiation slot, and a high gain omnidirectional radiation pattern can be obtained in the horizontal plane. You can

According to the tenth aspect of the invention, one or a plurality of radial slots parallel to the axis are provided in the conductor wall of a cylindrical conductor having a short-circuited terminal end having a central conductor, and a square is formed from the side wall of the radial slot. A conductor rod extending toward the inside of the waveguide is provided, and a trumpet-shaped conductor that spreads with a required taper angle is attached to both ends of the cylindrical conductor of the antenna device that excites the cylindrical conductor to feed the radiation slot. As a result, the beam width in the vertical plane can be narrowed by changing the taper angle of the trumpet-shaped conductor without changing the size or position of the radiation slot, and a high gain omnidirectional radiation in the horizontal plane can be obtained. You can get the pattern.

According to the eleventh aspect of the present invention, one or a plurality of radiation slots parallel to the axis are provided in the conductor wall of the cylindrical conductor of which the terminal is short-circuited, and the cylindrical conductor is excited to excite the above. The cylindrical conductor of the antenna device feeding the radiation slot is dimensioned to be excited in the TE ₀₁ mode, so that the conductor rod extending from the sidewall of the radiation slot to the inside of the cylindrical conductor is not inserted and is parallel to the tube axis. The radiating slot provided at is excited to obtain an omnidirectional radiation pattern in the horizontal plane.

According to the twelfth aspect of the present invention, a radiating slot is provided in the conductor wall of the terminating short-circuited rectangular waveguide, and the waveguide of the antenna device for exciting the rectangular waveguide to feed the radiating slot. A plurality of radiation slots parallel to the tube axis are provided on the center lines of both H surfaces of the tube, and conductor rods extending from the sidewalls of the radiation slots to the inside of the rectangular waveguide are provided. The field has an asymmetric distribution with respect to the center, the radiation slot provided in the center of the H plane is excited, and an omnidirectional radiation pattern can be obtained in a horizontal plane without beam tilt.

According to the thirteenth aspect of the present invention, a radiating slot is provided in the conductor wall of a rectangular waveguide with a short-circuited terminal, and the waveguide of the antenna device for exciting the rectangular waveguide to feed the radiating slot. By providing a plurality of radiation slots parallel to the tube axis on the center lines of both H surfaces of the tube, and by arranging a dielectric at a position asymmetric with respect to the tube axis inside the rectangular waveguide,
The electromagnetic field inside the rectangular waveguide has an asymmetric distribution with respect to the center, and the radiation slot provided at the center of the H plane is excited,
An omnidirectional radiation pattern can be obtained in the horizontal plane without beam tilt.

According to the fourteenth aspect of the present invention, a radiating slot is provided in the conductor wall of the rectangular waveguide with a short-circuited terminal, and the waveguide of the antenna device for exciting the rectangular waveguide to feed the radiating slot. A plurality of radiating slots parallel to the tube axis are provided on the center lines of both H surfaces of the tube, and the above-mentioned rectangular waveguide is TE ₂₀
Since the size is set to be excited in the mode, the electric field becomes zero at the center of the H-plane, the radiation slot in the tube-axis direction provided at the center of the H-plane is excited in the opposite phase, and the radiation pattern is omnidirectional in the horizontal plane. Can be obtained.

Further, in the invention according to claim 15, in the conductor wall of the cylindrical conductor of the terminal short circuit having the center conductor therein,
A plurality of radiation slots parallel to the axis are provided in the circumferential direction, and the central conductor of the antenna device that excites the cylindrical conductor to feed the radiation slot is formed into a spiral or loop shape, so that the outer conductor flows. An electric current flows obliquely with respect to the tube axis, and a radiation slot provided in parallel with the tube axis is excited, so that an omnidirectional radiation pattern can be obtained in a horizontal plane.

According to the sixteenth aspect of the present invention, a pair of microstrip antennas having one-sided short-circuit patch conductors on the ground conductor plate are symmetrically oriented parallel to each other on both ground conductor plate surfaces, and then one micro The radiated electric field becomes continuous in the azimuth direction by setting the strip antenna at a position rotated 180 degrees while maintaining the direction of the ground conductor plate surface and feeding the two one-sided short-circuit patch conductors in opposite phases to each other in the horizontal plane. An omnidirectional radiation pattern can be obtained.

Further, in the invention according to claim 17, both ends of the ground conductor plate are bent in mutually opposite directions, the tips of the respective bent parts are further folded back to form the one-sided short-circuit patch conductor, and the two one-sided short-circuited. By feeding the patch conductors in opposite phases to each other, the radiated electric field becomes continuous in the azimuth direction, and an omnidirectional radiation pattern can be obtained in the horizontal plane.

According to the eighteenth aspect of the present invention, the antenna device of the sixteenth aspect is provided with a non-feeding conductor having the same shape as the one-sided short-circuited patch conductor symmetrically facing the one-sided short-circuited patch conductor on the ground conductor plate. As a result, the structure becomes symmetrical, and an omnidirectional radiation pattern can be obtained in the horizontal plane.

Further, in the invention according to claim 19, the center point of the ground conductor plate of the microstrip antenna having the one-side short-circuit patch conductor on the ground conductor plate is the center of symmetry, and the other one-side short-circuit patch conductor is the ground conductor. The two patch conductors are provided at symmetrical positions on the back surface of the plate, and as an electric power feeding line for feeding the two patch conductors, an inner conductor of the electric power feeding line is connected to a ground conductor plate, and an outer conductor of the electric power feeding line is divided into two. , And by feeding in opposite phases to each other, the structure of the feeding circuit can be simplified and an omnidirectional radiation pattern can be obtained in the horizontal plane.

In the invention according to claim 20, as a radome for protecting the antenna device according to any one of claims 1 to 19, a conductive film is attached to the inside of the radome, and a radiation slot oriented in the vertical direction is provided. By providing the plurality in the circumferential direction, radio waves are re-emitted from the radome, and an omnidirectional radiation pattern can be obtained in the horizontal plane without being affected by the radome.

In the transponder of the invention according to claim 21, the antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, a transceiver, and a switch for enabling reception. By providing a means for informing the emergency signal sender that the transponder is activated and is in the reception waiting state, it is possible to prevent the emergency signal sender from forgetting to turn on the switch.

In the transponder of the invention according to claim 22, the antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, a transceiver, and the transponder are activated and transmitting. By providing the means for notifying the emergency signal sender of the state, the emergency signal sender can confirm that the transponder is activated and transmitting.

Further, in the transponder of the invention according to claim 23, the antenna device according to any one of claims 1 to 19, a radome for protecting the antenna, a transceiver, and a switch for enabling reception. With the provision of the radio wave for notifying the emergency signal sender of the level at which the transponder has received the radio wave, the emergency signal sender can know that the searcher is approaching.

[0056]

EXAMPLES Example 1. 1A and 1B are schematic configuration diagrams showing a first embodiment of the present invention. FIG. 1A is a perspective view, FIG. 1B is an AA sectional view, and FIG. 1C is a BB sectional view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, 3 is a conductor that connects both ground conductor plates, 4 is a dielectric, and 5 is a strip conductor. Are configured. Reference numeral 7 is a coaxial connector for feeding the triplate line, and 8 is a coaxial line.

FIG. 2 is a diagram for explaining the operation principle of the first embodiment. The radio wave propagating through the coaxial line 8 is the coaxial connector 7
Through the trip plate line 6. By inserting the dielectric 4 inside the ground conductor plate, the triplate line 6 is made small, and the antenna can be miniaturized. The end of the triplate line 6 is connected to the side wall of the radiation slot 1,
That is, a voltage is applied between the strip conductor 5 and the ground conductor plate 2. The end of the triplate line 6 is the radiation slot 1
Since they are connected in opposite directions to the side walls of, the electric fields inside the cavity formed by the ground conductor plate 2 and the conductor 3 connecting the ground conductor plates are in opposite directions. Therefore, the radiation slots provided on both ground conductor plates 2 are excited with opposite phases (180 degrees phase difference). The radiation field from this radiation slot is continuous in the horizontal plane (azimuth direction), and a horizontally polarized omnidirectional radiation pattern is obtained. Further, although an example in which power is fed by the triplate line 6 is shown, it is needless to say that the same effect as above can be obtained by feeding by another power feed line such as a coaxial line.

FIG. 3 shows radiation pattern measurement values of the antenna device according to the first embodiment. 360 in the horizontal plane in the horizontal plane
The measured values of the horizontal polarization and the vertical polarization when rotated by one degree are shown. Horizontally polarized ripple is within 2 dB,
Almost omnidirectional is obtained. The vertical polarization, which is cross polarization, has good characteristics of -20 dB or less.

Example 2. 4A and 4B are schematic configuration diagrams showing a second embodiment of the present invention, in which FIG. 4A is a perspective view and FIG.
Sectional drawing, (c) is a BB sectional view. In the figure, 1
Is a radiation slot, 2 is a ground conductor plate, 3 is a conductor for connecting the ground conductor plate, 4 is a dielectric, 5 is a strip conductor, and the ground conductor plate 2 and the strip conductor 5 constitute a tri-plate line 6. . Reference numeral 7 is a coaxial connector for feeding the triplate line.

Next, the operation principle will be described. Unlike the first embodiment, the end of the triplate line 6 passes through the radiation slot 1 and is connected to the side wall on the opposite side. That is, a voltage is directly applied to both ends of the radiation slot 1 by the triplate line 6, and the radiation slot 1 is excited. The radiation slots provided on both ground conductor plates are excited in opposite phases (180-degree phase difference), so the radiation field from these radiation slots is continuous in the horizontal plane (azimuth direction), and there is no directivity for horizontal polarization. A sexual radiation pattern is obtained. In the present embodiment, an example in which the end of the line is short-circuited to the end of the radiating slot is shown, but the end is opened and the length from the radiating slot to the open end is approximately 1 /.
Similar characteristics can be obtained with four wavelengths.

Example 3. 5A and 5B are schematic configuration diagrams showing a third embodiment of the present invention, in which FIG. 5A is a perspective view and FIG.
Sectional drawing, (c) is a BB sectional view. In the figure, 1
Is a radiation slot, 2 is a ground conductor plate, 3 is a conductor for connecting the ground conductor plate, 4 is a dielectric, 5 is a strip conductor, and the ground conductor plate 2 and the strip conductor 5 constitute a tri-plate line 6. . Reference numeral 7 is a coaxial connector for feeding the triplate line.

Next, the operation principle will be described. Example 1
With the same principle as above, a horizontally polarized omnidirectional radiation pattern is obtained. Here, in order to resonate at the same resonance frequency by hollowing out the dielectric material only between the radiation slots provided on the opposing ground conductor plates 2, there is no wavelength shortening effect due to the dielectric material and there is a dielectric material. In comparison, it is necessary to lengthen the radiation slot. When the radiation slot is made longer, the beam width becomes narrower, the gain in the front direction increases, and the gain in the horizontal plane can be increased.

Example 4. 6A and 6B are schematic configuration diagrams showing a fourth embodiment of the present invention, in which FIG. 6A is a perspective view and FIG.
Sectional drawing, (c) is a side view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, 3 is a conductor for connecting the ground conductor plate, 4 is a dielectric, 5 is a strip conductor, and the ground conductor plate 2 and the strip conductor 5 form a microstrip line 10. I am configuring. Reference numeral 7 is a coaxial connector for feeding the microstrip line, and 11 is a second dielectric.

Next, the operation principle will be described. The end of the microstrip line 10 is open. At the open end, the electric field is maximum and the magnetic field is minimum. The magnetic field is maximum at a position of a quarter wavelength from the open end, and by placing the radiation slot at this position, the radiation slot is electromagnetically coupled and excited. Since the radiation slot 1 provided on both ground conductor plates is excited by the microstrip line in opposite phase (180 degree phase difference), the radiation field from this radiation slot is continuous in the horizontal plane (azimuth direction) and horizontal. An omnidirectional radiation pattern of polarization is obtained.
Although the end of the microstrip line is opened to excite the radiation slot in this embodiment, the same effect can be obtained by directly feeding the end of the microstrip line to the side wall of the radiation slot using a through hole or the like. can get. Needless to say, the same effect can be obtained even if the second dielectric material inside both ground conductor plates is an air layer.

Example 5. 7A and 7B are schematic configuration diagrams showing a fifth embodiment of the present invention. FIG. 7A is a perspective view and FIG. 7B is AA.
Sectional drawing, (c) is a side view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, 3 is a conductor for connecting the ground conductor plate, and 12a to 12d are conductor wires.

Next, the operation principle will be described. The center conductor 13 of the power feeding connector 7 is connected to the conductor wire and is divided into two, and each of the center conductor 13 is further divided into two and the conductor wires 12a and 12 are
b, 12c, 12d, of which conductor lines 12a, 1
2b is connected to a side wall of a radiation slot provided on the same ground conductor plate, and the other conductor lines 12c and 12d are connected to side walls of a radiation slot provided on another facing ground conductor plate. In this case, since the difference between the lengths of the feed lines that feed the adjacent radiation slots on the same ground conductor plate is an integral multiple of the wavelength, the adjacent radiation slots on the same ground conductor plate are excited in the same phase and face each other. Is excited in the opposite phase to the radiation slot on the same ground conductor plate. Therefore, the radiation slots on the same ground conductor plate are in phase with each other in the horizontal plane, the gain in the horizontal plane is increased, and the radiation slots are excited in the opposite phase to the radiation slots on the facing ground conductor plate. The radiation field is continuous in the horizontal plane, and an omnidirectional radiation pattern with high gain of horizontal polarization is obtained. Therefore, the beam width can be adjusted by changing the distance between the two radiation slots on the same ground conductor plate. Although two radiation slots are shown here as an example, the present invention is not limited to this and is generally effective for a plurality of radiation slots, and it goes without saying that similar effects can be obtained. Further, as the power feeding line, another line such as a coaxial line may be used.

Example 6. 8A and 8B are schematic configuration diagrams showing a sixth embodiment of the present invention, in which FIG. 8A is a perspective view and FIG. 8B is AA.
Sectional drawing, (c) is a side view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, 3 is a conductor for connecting the ground conductor plate, 5a to 5d are strip conductors, and the strip conductor is sandwiched between the ground conductor plates to form a triplate line 6. . Reference numeral 7 is a coaxial connector for feeding the triplate line. Reference numeral 13 is a central conductor of the coaxial connector.

Next, the operation principle will be described. The center conductor 13 of the power feeding connector 7 is connected to the strip line 5
The strip conductors 5a, 5b, 5c, and 5d are further divided into strip conductors 5a, 5b, 5c, and 5d. Of these, the strip lines 5a and 5d are connected to the side walls of the radiation slot provided on the same ground conductor plate, and the other strip lines 5b and 5c.
Is connected to the side wall of the radiation slot provided on the opposite ground conductor plate. In this case, since the difference between the lengths of the feed lines that feed adjacent radiation slots on the same ground conductor plate is an odd multiple of half a wavelength, it is excited in the same phase, and the radiation slots on opposite ground conductor plates are in opposite phase. Be excited. Therefore, the radiation slots on the same ground conductor plate are in phase with each other in the horizontal plane, the gain in the horizontal plane is increased, and the facing radiation slots are excited in opposite phases, so that the radiation field from the radiation slots is in the horizontal plane. It becomes continuous and an omnidirectional radiation pattern with high gain of horizontal polarization is obtained. Therefore, the beam width can be adjusted by changing the distance between the two radiation slots on the same ground conductor plate. Here, an example of two radiation slots on the same ground conductor plate is shown, but the present invention is not limited to this and is generally effective for a plurality of radiation slots, and it goes without saying that similar effects can be obtained. As the power feeding line, another line such as a coaxial line may be used.

Example 7. 9A and 9B are schematic configuration diagrams showing a seventh embodiment of the present invention. FIG. 9A is a perspective view and FIG. 9B is AA.
FIG. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, 3 is a conductor connecting the ground conductor plates, and 14 is a pin connecting both ground conductor plates.

The operation principle is the same as in the fifth and sixth embodiments. In this case, the periphery of the radiation slot is surrounded by the ground conductor plate, and it can be considered as one kind of waveguide. Therefore, the modes of the waveguide are also excited. When the width of the ground conductor plate is less than half a wavelength, only the fundamental mode propagates, and the radiation slot is provided at the center of the ground conductor plate, and although it is not excited originally, the internal electromagnetic field is disturbed due to the internal feed line. The radiating slot will be excited. Since the phase difference in the excitation by the mode of the waveguide is different from that in the case where the radiation slot is excited by the feed line, the excitation amplitude phase of the radiation slot is disturbed and an omnidirectional radiation pattern cannot be obtained. Therefore, a non-directional radiation pattern can be obtained by connecting both ground conductor plates with a pin to suppress unnecessary waveguide modes. Here, an example is shown in which unnecessary modes are suppressed by using pins, but it is needless to say that the present invention is effective even if a conductor rod or a conductor plate is used, and similar effects can be obtained.

Example 8. FIG. 10 is a schematic configuration diagram showing an eighth embodiment of the present invention, (a) is a perspective view and (b) is a side view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, and 15 is a trumpet-shaped metal conductor that spreads to the outside.

Next, the operation principle will be described. The operation principle of omnidirectionally excited horizontal polarization is the same as that of the first embodiment. As in Example 1, when there is only one radiation slot on each of the ground conductor plates facing each other, there is a limit in changing the beam width in the elevation direction, and there is a limit in obtaining a high gain. is there. Examples of arranging a plurality of radiation slots on specific opposing ground conductor plates are shown in Examples 5 and 6, but in the present example, in order to narrow the beam width in the elevation direction, At the upper end and the lower end of any of the placed antenna devices shown in the first to fourth embodiments, one end has the same shape as the upper end and the lower end of the antenna device, and the other end has a required taper angle. An example of attaching a spreading trumpet-shaped conductor is shown. It is considered that the trumpet-shaped conductor operates the same as one kind of horn antenna. That is, the size of the opening of the horn determines the gain, and the size of the opening of the horn may be increased to increase the gain. Therefore, the gain can be increased even when there is only one radiation slot on each of the ground conductor plates facing each other. Since the taper of the trumpet-shaped conductor is symmetrical in the circumferential direction, it does not affect the omnidirectional pattern in the horizontal plane. Further, the beam width can be adjusted by changing the taper inclination α from the vertical, and the gain can be easily changed.

Example 9. FIG. 11 is a schematic configuration diagram showing a ninth embodiment of the present invention, (a) is a perspective view, (b) is a top view, and (c) is a side view. In the figure, 1 is a radiation slot, 2 is a ground conductor plate, and 16 is a second connecting to both ground conductor plates.
It is a ground conductor plate.

Next, the operating principle will be described. In principle, an omnidirectional radiation pattern can be obtained if the ground conductor plate provided with a radiation slot is infinite, but since the ground conductor plate is finite, ripples will occur due to the interference of diffracted waves at the end of the ground conductor plate. Occurs. This ripple varies depending on the size of the ground conductor plate,
Its period is about one wavelength. Therefore, in order to minimize the size of the ripple by apparently changing the size of the ground conductor plate provided with the radiation slot, the embodiment 1 placed vertically is adopted.
6 to 10, an example in which a semi-cylindrical shape is attached to both side surface portions (ground conductor plates having no radiation slots) of any of the antenna devices shown in the fourth embodiment will be described. Here, a semi-cylindrical shape is used in order to apparently change the size of the ground conductor plate provided with the radiation slot, but it is needless to say that the present invention is effective not only in this but also in the shape of an elliptic cylinder or the like. Also, the first
An air layer or a dielectric may be provided between the connection conductor of 1) and the second connection conductor.

Example 10. FIG. 12 is a first embodiment of the present invention.
It is a schematic block diagram which shows 0, (a) is a perspective view, (b) is a top view, (c) is a side view. In the figure, 1 is a radiation slot, 15 is a trumpet-shaped conductor that spreads to the outside, 17 is a cylindrical conductor, 18 is a waveguide flange, and 19 is a conductor rod.

Next, the operation principle will be described. Circular waveguide with short-circuited termination in TM ₀₁ mode (magnetic field is uniform in the circumferential direction)
Then, the electric current flows in the tube axis direction. When the radiation slot is provided in parallel with the tube axis, the current is not crossed so that the radiation slot is not excited. However, by providing the conductor rod 19 facing the inside of the circular waveguide from the sidewall of the radiation slot, the radiation slot is excited. By arranging one radiation slot or a plurality of radiation slots in the circumferential direction, omnidirectional horizontal polarization can be obtained. Here, in order to narrow the beam in the elevation direction, a plurality of radiation slots may be arranged in a line parallel to the tube axis on the tube wall of the circular waveguide. However, since the radiation slot is excited by exciting the waveguide with the short-circuited termination, the position of the standing wave shifts and the amplitude and phase of the excitation wave change in the radiation slot when the excitation frequency of the waveguide shifts. Therefore, the radiation pattern obtained by combining the radiation fields from the slots changes. Therefore, in this embodiment, trumpet-shaped conductors are provided at both ends of a circular waveguide placed vertically to narrow the beam in the elevation direction. The effect of this trumpet-shaped conductor is the same as that of the eighth embodiment. In this embodiment, an example of exciting the radiation slot by using a conductor rod has been shown, but the present invention is also effective if the radiation slot is excited by arranging the radiation slot with an inclination with respect to the tube axis.

Example 11. FIG. 13 is a first embodiment of the present invention.
1A and 1B are schematic configuration diagrams showing No. 1, FIG. 1A is a perspective view, FIG. 1B is a top view, and FIG. In the drawing, 1 is a radiating slot, 15 is a trumpet-shaped conductor that spreads to the outside, 17 is a cylindrical conductor, 19 is a conductor rod, and 20 is a coaxial central conductor.

Next, the operation principle will be described. In the fundamental mode (the magnetic field is uniform in the circumferential direction) in the coaxial line with the terminal short-circuited, the current flows in the tube axis direction. The radiation slot is not excited only by providing the radiation slot parallel to the tube axis, but the radiation slot is excited by inserting the conductor rod 19 facing the inside of the coaxial line from the sidewall of the radiation slot. By arranging one radiation slot or a plurality of radiation slots in the circumferential direction, omnidirectional horizontal polarization can be obtained. here,
In order to narrow the beam in the elevation direction, a plurality of radiation slots may be arranged in a line parallel to the tube axis. However, since the radiation slot is excited by exciting the waveguide with the short-circuited termination, the position of the standing wave shifts and the amplitude and phase of the excitation wave change in the radiation slot when the excitation frequency of the waveguide shifts.
Therefore, the radiation pattern obtained by combining the radiation fields from the slots changes. Therefore, in this embodiment, trumpet-shaped conductors are provided at both ends of a circular waveguide placed vertically to narrow the beam in the elevation direction. The effect of this trumpet-shaped conductor is the same as that of the eighth embodiment.

Example 12. FIG. 14 is a first embodiment of the present invention.
It is a schematic block diagram which shows 2, and (a) is a perspective view and (b) has shown the electromagnetic field distribution of the AA cross section. (C) shows the current distribution on the side surface. In the figure, 1 is a radiation slot, 17 is a cylindrical conductor, and 18 is a flange.

Next, the operating principle will be described. A circular waveguide which is terminated short TE ₀₁ mode (uniform electric field in the circumferential direction)
When excited by, current flows in the circumferential direction. That is, the radiation slot is easily excited simply by providing the radiation slot parallel to the tube axis. By arranging one radiation slot or a plurality of radiation slots in the circumferential direction, omnidirectional horizontal polarization can be obtained. To narrow the beam in the elevation direction, arrange a plurality of these radiation slots in the tube axis direction, or
Alternatively, trumpet-shaped conductors may be provided at both ends of the circular waveguide whose ends are short-circuited.

Example 13 FIG. 15 is a first embodiment of the present invention.
3A and 3B are schematic configuration diagrams showing the configuration of FIG. 3, where FIG. 3A is a perspective view, FIG. 3B is a sectional view taken along line AA, and FIG. In the figure, 1
Is a radiation slot, 19 is a conductor rod, and 21 is a rectangular waveguide.

Next, the operation principle will be described. When a short-circuited rectangular waveguide is excited in the TE ₁₀ mode, it is necessary to offset it from the center of the tube axis in order to excite the radiation slot. In this case, since beam tilt occurs as in the conventional example, there is a problem that the ripple in the horizontal plane becomes large. Therefore, in this embodiment, a plurality of radiation slots are provided in parallel with the tube axis on the center line of the H surface of the rectangular waveguide, and the conductor rod is inserted into the waveguide from the side wall of the radiation slot. Due to the conductor rod, the electromagnetic field inside the rectangular waveguide has an asymmetric distribution with respect to the center, the radiation slot provided at the center of the H plane is excited, and an omnidirectional radiation pattern without beam tilt can be obtained. .

Example 14 16 shows a first embodiment of the present invention.
4A is a schematic configuration diagram showing No. 4, where FIG. 4A is a perspective view, FIG. 4B is a sectional view taken along line AA, and FIG. In the figure, 1 is a radiation slot, 18 is a flange, 21 is a rectangular waveguide, and 22 is a dielectric inserted inside the rectangular waveguide.

Next, the operation principle will be described. When a short-circuited rectangular waveguide is excited in the TE ₁₀ mode, it is necessary to offset it from the center of the tube axis in order to excite the radiation slot. In this case, since beam tilt occurs as in the conventional example, there is a problem that the ripple in the horizontal plane becomes large. Therefore, in this embodiment, a plurality of radiation slots are provided on the center line of the H surface of the rectangular waveguide in parallel with the tube axis, and a dielectric is inserted at a position asymmetric with respect to the center of the waveguide. The electromagnetic field inside the wave tube is disturbed to excite the radiation slot. Since no conductor bar is used, soldering is unnecessary.

Example 15. FIG. 17 is a first embodiment of the present invention.
5 is a schematic configuration diagram showing No. 5, in which (a) is a perspective view and (b) is an electric field distribution in the AA cross section. In the figure, 1 is a radiation slot, 18 is a flange, and 21 is a rectangular waveguide.

Next, the operation principle will be described. In the electromagnetic field distribution when a rectangular waveguide with a short-circuited termination is excited in the TE ₂₀ mode, the electric field is zero at the center of the H plane, as shown in (b). Therefore, the radiation slots on the front and back sides are easily excited in opposite phases only by providing the radiation slots at this position. The radiation field from this radiation slot is continuous in the horizontal plane, and a horizontally polarized omnidirectional radiation pattern is obtained.

Example 16 FIG. 18 shows a first embodiment of the present invention.
It is a schematic block diagram which shows 6. In the figure, 1 is a radiation slot, 17 is a cylindrical conductor, and 23 is a spiral conductor.

Next, the operation principle will be described. In the fundamental mode (the magnetic field is uniform in the circumferential direction) in the coaxial line with the terminal short-circuited, the current flows in the tube axis direction. Therefore, when the radiation slot is provided parallel to the tube axis, the radiation slot is not excited. Instead of inserting the conductor rod shown in the thirteenth embodiment or the dielectric material shown in the fourteenth embodiment, the central conductor of the coaxial line is formed into a spiral shape. As a result, the current flowing through the tube wall flows obliquely along the tube axis, so that the radiation slot provided parallel to the tube axis is excited. By arranging one or more in the circumferential direction, an omnidirectional radiation pattern in the horizontal plane can be obtained. In order to narrow the beam in the elevation direction, a plurality of the radiation slots may be arranged in the tube axis direction, or a trumpet-shaped conductor as described in the eleventh embodiment may be provided. Also,
The spiral portion may be a part or part of the radiation slot, and the tip of the inner conductor may be open or short-circuited.

Example 17 FIG. 19 shows the first embodiment of the present invention.
7 is a schematic configuration diagram showing No. 7, in which (a) is a perspective view and (b) is an electric field distribution in the AA cross section. In the figure, 2 is a ground conductor, 12 is a conductor wire, and 24 is a patch conductor with a short circuit on one side.

Next, the operation principle will be described. A microstrip antenna with a one-sided short-circuit patch conductor does not disturb the internal electric field even if a barrier (short-circuit conductor) is provided at a position where the internal electric field is zero in the microstrip antenna. It is a thing. By feeding power from a position perpendicular to the short-circuit conductor, polarized waves perpendicular to the short-circuit conductor are excited as in the microstrip antenna. Therefore, as shown in FIG. 19, a pair of microstrip antennas having one-sided short-circuit patch conductors on the ground conductor plate are symmetrically oriented parallel to the ground conductor plate surface, and then one of the microstrip antennas is kept in the surface direction. However, the radiation field is continuous in the horizontal plane (azimuth direction) by arranging them in a position rotated by 180 degrees and feeding the two one-sided short-circuit patch conductors in opposite phases to each other to obtain an omnidirectional radiation pattern. You can

Example 18. FIG. 20 shows the first embodiment of the present invention.
9A and 9B are schematic configuration diagrams showing No. 8, in which FIG. 8A is a perspective view, and FIG. In the figure, 2
Is a ground conductor, 8 is a coaxial line, 13 is a center conductor, and 25 is a two-way divider.

Next, the operation principle will be described. Both ends of one ground conductor plate are bent in mutually opposite directions, and the ends of the bent parts are further folded back to form the one-side short-circuit patch conductor, and the two one-side short-circuit patch conductors are fed in opposite phases to each other. When a potential difference is applied to the folded portion as described above, it is equivalently equivalent to two one-side short-circuited microstrip antennas. Therefore, as in the seventeenth embodiment, by feeding two patch conductors short-circuited on one side in antiphase, the radiated electric field becomes continuous in the horizontal plane (azimuth direction), and an omnidirectional radiation pattern is obtained.

Example 19 FIG. 21 shows the first embodiment of the present invention.
9A and 9B are schematic configuration diagrams showing the electric field distribution, wherein FIG. 9A is a perspective view, and FIG. In the figure, 2
Is a ground conductor, 7 is a coaxial connector, 12 is a conductor wire, 24 is a one-side short-circuited patch conductor (power is supplied), and 26 is a second one-side short-circuited patch conductor (does not supply power).

Next, the operation principle will be described. The principle of operation for obtaining omnidirectionality is the same as in Examples 17 and 18, and as shown in FIG. 21, a pair of microstrip antennas having one-sided short-circuit patch conductors are provided on the ground conductor plate 2 to form a ground conductor plate. Face the planes in parallel and symmetrically, and then hold one of the microstrip antennas while keeping the direction of the plane 1
The antenna device, which is arranged at a position rotated by 80 degrees, feeds the two one-sided short-circuit patch conductors in opposite phases to each other, and further symmetrically faces the one-sided short-circuit patch conductor on the same ground conductor plate and has the same shape of power feeding. It has a symmetrical structure by providing a one-sided short-circuit patch conductor. By feeding the two one-side short-circuited microstrip antennas configured as described above in opposite phases, the radiated electric field becomes continuous in the horizontal plane (azimuth direction). However, the asymmetric structure cannot reduce the ripple in the horizontal plane. In order to obtain a bilaterally symmetrical structure, a second one-side short-circuited patch conductor that does not feed power is provided at a symmetrical position as shown in FIG.
This results in a symmetrical structure and improves the directivity in the horizontal plane.

Example 20. 22 shows a second embodiment of the present invention.
It is a schematic block diagram which shows 0, (a) is a perspective view, (b) is an AA sectional view, (c) is a side view. In the figure, 2
Is a ground conductor, 8 is a coaxial line, 20 is an inner conductor of the coaxial line, 2
Reference numeral 4 is a short-circuited patch conductor, and 27 is an outer conductor of the coaxial line.

Next, the operation principle will be described. Example 1
When the ground conductor plate is common and there are two radiation conductors for feeding as shown in 7, 18, and 19, it is necessary to divide the inner conductor of the feeding line into two, which complicates the configuration. Therefore, in this embodiment, the outer conductor of the coaxial line is divided into two to feed the radiation conductor and the inner conductor to the ground conductor plate. In this case, the operating principle is the same as that of dividing the inner conductor into two, and the structure of the power feeding circuit is simplified.

Example 21. 23 shows a second embodiment of the present invention.
It is a schematic block diagram which shows 1. In the figure, 28 is a radome, 29 is a radiation slot provided in the radome, and 30 is an omnidirectional antenna.

Next, the operation principle will be described. Example 1
A radome is required to protect the omni-directional antenna of any of Example 20 from Figure 1, but the radiation pattern is affected by this radome. Therefore, a radiation slot 29 is provided in the radome in order to re-radiate the radome and make the radiation omnidirectional. By providing a plurality of radiation slots 29 in the circumferential direction, the radiation is re-radiated from the radome and an omnidirectional radiation pattern is obtained without being affected by the radome. A plurality of the radiation slots 29 may be arranged in the elevation direction.

Example 22. 24 is a schematic configuration diagram showing a twenty-second embodiment of the transponder of the present invention. In the figure, 28 is a radome, 30 is an omnidirectional antenna according to any one of Embodiments 1 to 20, 33 is a transceiver, 34 is a battery case, 35 is a switch, 36 is an indicator for indicating a start / reception standby state, Reference numeral 37 is a display indicating that transmission is in progress, 38 is a display indicating the reception level, and 39 is a cable connecting the respective displays. By using a small omnidirectional antenna as compared with the conventional waveguide slot antenna, the man-machine can be improved within a predetermined volume and weight.
In particular, it relates to improvement of the relationship between the operator and the machine when an emergency call is required.

Here, as an example of means for notifying that the transponder is in a state of receiving and transmitting radio waves, that is, activated and in a reception standby state, the transponder is provided with a display device 36 showing a startup / reception standby state, It can prevent the signaler from forgetting to switch on in an emergency. Also,
An indicator 3 showing transmission as an example of means for the emergency signal sender to know that the transponder has started and is in the state of transmission
7, the emergency signal sender can confirm that the transponder is operating reliably. Further, as a means for the emergency signal sender to know the level at which the transponder has received the radio wave, the emergency signal sender is provided with a display 38 for indicating the reception level so that the emergency signal sender can know the approaching state of the searcher.

[0101]

As described above, according to the first aspect of the present invention, the radiation slots that are vertically oriented are provided in each of the ground conductor plates of a specific facing vertical surface of the ground conductor plate having a rectangular parallelepiped shape. Horizontally polarized omnidirectional antenna device of small size and simple in construction, in which slots are fed in mutually opposite phases by feeding lines and the inside of the ground conductor plate having the rectangular parallelepiped shape is filled with a dielectric. Can be obtained.

According to the invention of claim 2, between the radiation slots provided on the ground conductor plates of the specific facing vertical planes of the ground conductor plate forming the rectangular parallelepiped shape of the antenna device of claim 1. To obtain a small, high-gain omnidirectional antenna device in a horizontal plane of horizontal polarization that is simple and easy to structure by hollowing out only the dielectric part and lengthening the long side of the radiation slot to resonate at the same resonance frequency. You can

According to the third aspect of the present invention, the radiation slots that are vertically oriented are provided in the ground conductor plates of the specific facing vertical surfaces of the ground conductor plate having the rectangular parallelepiped shape. It is possible to obtain a horizontal polarization omnidirectional antenna device having a simple configuration by providing a feed line coupled to the outside of the ground conductor plate and feeding the radiation slots in mutually opposite phases.

According to the fourth aspect of the present invention, a plurality of radiating slots which are vertically oriented are arranged in a row in each of the ground conductor plates of a specific facing vertical surface of the ground conductor plate having a rectangular parallelepiped shape. The radiation slots provided on the ground conductor plates on the matching vertical planes are fed in opposite phases, and the adjacent radiation slots on the same ground conductor plate are fed in the same phase. An omnidirectional antenna device with gain can be obtained.

According to the fifth aspect of the present invention, a plurality of radiating slots which are vertically oriented are arranged in a row in each of the ground conductor plates of the specific facing vertical surfaces of the ground conductor plate having a rectangular parallelepiped shape. The radiation slots provided on the ground conductor plates on the matching vertical planes are fed in opposite phases, and the adjacent radiation slots on the same ground conductor plate are fed in the same phase. A gain omnidirectional antenna device can be obtained.

Further, in the invention according to claim 6, the antenna device according to any one of claims 1 to 5 is provided on a ground conductor plate of a specific opposing vertical surface of the ground conductor plate having a rectangular parallelepiped shape. By providing pins for connecting the facing ground conductor plates in the vicinity of the radiation slot and suppressing the excitation of unnecessary waveguide modes, it is possible to obtain a high-gain omnidirectional antenna device in the horizontal plane.

In the invention according to claim 7, a trumpet-shaped conductor that spreads with a required taper angle is attached to the upper end and the lower end of the antenna device according to any one of claims 1 to 3, A beam in a vertical plane can be narrowed down without arranging a plurality of radiating slots that are vertically oriented in a row, and an omnidirectional antenna device having a high gain in a horizontal plane and having a simple structure can be obtained.

Further, in the invention according to claim 8, ground antenna plates forming a semi-cylindrical shape are attached to both sides of the antenna device according to any one of claims 1 to 6 to form a radiation slot. It is possible to obtain an omnidirectional antenna device by reducing the influence of the diffracted wave at the end of the ground conductor plate provided and adjusting the magnitude of the ripple in the horizontal plane.

According to the ninth aspect of the present invention, one or a plurality of radiation slots parallel to the axis are provided in the conductor wall of the cylindrical conductor having the short-circuited termination, and the rectangular waveguide is provided from the side wall of the radiation slot. A conductor rod facing the inside of the tube is provided on the side wall of the radiation slot, and a trumpet-shaped conductor that spreads with a required taper angle is attached to the upper and lower ends of the antenna device that excites the cylindrical conductor to feed the radiation slot. As a result, the beam in the vertical plane is narrowed down, and it is possible to obtain an omnidirectional antenna device having a high gain in a horizontal plane and having a simple structure.

According to the invention of claim 10,
One or a plurality of radial slots parallel to the axis are provided in the conductor wall of the cylindrical conductor having the center conductor of the terminal short circuit,
A conductor rod extending from the side wall of the radiating slot to the inside of the rectangular waveguide is provided on the side wall of the radiating slot, and a trumpet spread with a required taper angle at both ends of the antenna device for exciting the cylindrical conductor to feed the radiating slot. It is possible to obtain an omnidirectional antenna device having a high gain in a horizontal plane, which is simple in configuration, by attaching a circular conductor and narrowing the beam in the vertical plane.

According to the invention of claim 11,
One or a plurality of radiation slots parallel to the axis are provided on the conductor wall of the cylindrical conductor with a short-circuited terminal, and the cylindrical conductor of the antenna device for exciting the cylindrical conductor to feed the radiation slot is provided. It is possible to obtain an omnidirectional antenna device in a horizontal plane, which is dimensioned to be excited in the TE ₀₁ mode and has a simple structure.

According to the invention of claim 12,
A plurality of radiating slots parallel to the tube axis are provided on the center lines of both H faces of the rectangular waveguide with short-circuited terminations, and a conductor rod extending from the side wall of the radiating slot toward the inside of the rectangular waveguide is provided. It is possible to obtain an omnidirectional antenna device in a horizontal plane having no beam tilt by exciting the radiating slots as a distribution in which the internal electromagnetic field is asymmetric with respect to the center.

According to the invention of claim 13,
A plurality of radiating slots parallel to the tube axis are provided on the center lines of both H surfaces of the rectangular waveguide with short-circuited terminals, and a dielectric is provided inside the rectangular waveguide at an asymmetric position with respect to the tube axis. It is possible to obtain an omnidirectional antenna device in a horizontal plane having no beam tilt by exciting the radiation slots with the electromagnetic field inside the waveguide being asymmetrical with respect to the center.

According to the fourteenth aspect of the invention,
A plurality of radiating slots parallel to the tube axis are provided on the center lines of both H surfaces of the rectangular waveguide with the short-circuited terminals, and the rectangular waveguide is TE _20.
Radiation slots provided at the centers of both H-planes are excited in opposite phases as dimensions to be excited in a mode, and an omnidirectional antenna device in a horizontal plane having a simple structure can be obtained.

Further, according to the invention of claim 15,
A plurality of radiating slots parallel to the axis are provided in the circumferential direction on the conductor wall of a cylindrical conductor with a short-circuited termination having a central conductor inside,
It is possible to obtain an omnidirectional antenna device in a horizontal plane having a simple structure by exciting the radiation slot by making the central conductor that excites the cylindrical conductor spiral or loop.

According to the sixteenth aspect of the invention,
A pair of microstrip antennas having one-sided short-circuit patch conductors on the ground conductor plate are placed symmetrically with respect to the ground conductor plate surfaces in parallel, and then one of the microstrip antennas is placed at a position rotated 180 degrees while maintaining the surface direction. Then, the two one-sided short-circuit patch conductors are fed in opposite phases to each other, and an omnidirectional antenna device in a horizontal plane having a simple structure can be obtained.

Further, according to the invention of claim 17,
Bend both ends of one ground conductor plate in opposite directions,
Each of the bent portions is further folded back, and the folded portion is used as a one-sided short-circuit patch conductor, and the two one-sided short-circuit patch conductors are fed in opposite phases to each other to form an omnidirectional antenna device in a horizontal plane. Obtainable.

According to the invention of claim 18,
A pair of microstrip antennas having one-sided short-circuit patch conductors on the ground conductor plate are placed symmetrically with respect to the ground conductor plate surfaces in parallel, and then one of the microstrip antennas is placed at a position rotated 180 degrees while maintaining the surface direction. Then, the antenna device that feeds the two one-sided short-circuit patch conductors in opposite phases to each other, and further, the one-sided short-circuited patch conductors of the same shape that do not feed are symmetrically provided on the same ground conductor plate facing the one-side short-circuited patch conductor As a result, it is possible to obtain an omnidirectional antenna device having a symmetrical structure and having a simple structure in a horizontal plane.

Further, according to the invention of claim 19,
The center point of the ground conductor plate of the microstrip antenna having the one-side short-circuit patch conductor on the ground conductor plate is set as the center of symmetry, and another one-side short-circuit patch conductor is provided at the symmetrical position on the back surface of the ground conductor plate. As a feed line for feeding the patch conductors in opposite phases to each other, the inner conductor of the feed line is connected to the ground conductor plate, and the outer conductor of the feed line is divided into two parts, and the above-mentioned 2
It is possible to obtain an omnidirectional antenna device connected to two patch conductors and having a simple feed circuit configuration in a horizontal plane.

According to the twentieth aspect of the invention,
As a radome for protecting the in-plane omnidirectional antenna device according to any one of claims 1 to 19, a conductor film is attached to the inside of the radome, and a plurality of vertically oriented radiation slots are provided in the circumferential direction. An omnidirectional antenna device can be obtained in the horizontal plane without being affected by the radome.

According to the invention of claim 21,
An omnidirectional antenna in the horizontal plane according to any one of claims 1 to 19, and a radome for protecting the antenna,
A transponder that includes a transceiver and a switch that enables reception is provided with a means for an emergency caller to know that the transponder is activated and is in a reception waiting state, and the transponder can prevent the emergency caller from forgetting to turn on the switch. Can be obtained.

According to the invention of claim 22,
An omnidirectional antenna in the horizontal plane according to any one of claims 1 to 19, and a radome for protecting the antenna,
A transponder equipped with a transceiver is provided with a means for an emergency caller to know that the transponder is activated and in a transmitting state, and the emergency caller can obtain a transponder that can confirm that the transponder is operating reliably. it can.

Further, according to the invention of claim 23,
A horizontal plane omnidirectional antenna according to any one of claims 1 to 19, and a radome for protecting the antenna,
A transponder equipped with a transceiver and a switch for enabling reception provides a means for an emergency caller to know the level at which the transponder receives a radio wave, and the emergency caller can know the state that the searcher is approaching. A transponder can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing an operating principle of the first embodiment of the present invention.

FIG. 3 is a diagram showing radiation pattern measurement values of the antenna device according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a fourth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram showing a fifth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a sixth embodiment of the present invention.

FIG. 9 is a schematic configuration diagram showing a seventh embodiment of the present invention.

FIG. 10 is a schematic configuration diagram showing an eighth embodiment of the present invention.

FIG. 11 is a schematic configuration diagram showing Embodiment 9 of the present invention.

FIG. 12 is a schematic configuration diagram showing Embodiment 10 of the present invention.

FIG. 13 is a schematic configuration diagram showing an eleventh embodiment of the present invention.

FIG. 14 is a schematic configuration diagram showing Embodiment 12 of the present invention.

FIG. 15 is a schematic configuration diagram showing Embodiment 13 of the present invention.

FIG. 16 is a schematic configuration diagram showing Embodiment 14 of the present invention.

FIG. 17 is a schematic configuration diagram showing Embodiment 15 of the present invention.

FIG. 18 is a schematic configuration diagram showing Embodiment 16 of the present invention.

FIG. 19 is a schematic block diagram showing Embodiment 17 of the present invention.

FIG. 20 is a schematic configuration diagram showing an eighteenth embodiment of the present invention.

FIG. 21 is a schematic configuration diagram showing Embodiment 19 of the invention.

FIG. 22 is a schematic configuration diagram showing Embodiment 20 of the present invention.

FIG. 23 is a schematic configuration diagram showing Embodiment 21 of the present invention.

FIG. 24 is a schematic configuration diagram showing Embodiment 22 of the present invention.

FIG. 25 is a schematic configuration diagram showing a conventional antenna device.

FIG. 26 is a schematic configuration diagram showing another conventional antenna device.

FIG. 27 is a diagram showing an operating principle of a conventional antenna device.

FIG. 28 is a diagram showing an operating principle of a conventional antenna device.

FIG. 29 is a schematic configuration diagram showing a conventional transponder device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radiation slot 2 Ground conductor 3 Conductor connecting ground conductors 4 Dielectrics 5a to 5d Strip conductors 6 Tri-plate line 7 Coaxial connector 8 Coaxial line 9 Dielectric hollow 10 Microstrip line 11 Second dielectric 12a to 12d Conductor Line 13 Center conductor 14 Pin 15 Taper 16 Second connection conductor 17 Cylindrical conductor 18 Flange 19 Conductor rod 20 Coaxial center conductor 21 Rectangular waveguide 22 Dielectric body 23 inserted in rectangular waveguide 23 Spiral conductor 24 One side Short-circuit patch conductor 25 2 Distributor 26 Second one-side short-circuit patch conductor 27 Outer conductor of coaxial line 28 Radome 29 Slot provided in radome 30 Omnidirectional antenna 31 Dipole antenna 32 Waveguide slot antenna 33 Transceiver 34 Battery case 35 Switch 36 Start / wait for reception Indicator showing a display device 38 receiving level indicating to display 37 during transmission

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location G01S 13/79 H01Q 21/22 2109-5J (72) Inventor Shinichi Sato 5-1, 1-1 Ofuna, Kamakura-shi Mitsubishi (72) Inventor, Takashi Kataki, 1-1, Ofuna, Kamakura-shi, Electronic Systems Research Institute, Mitsubishi Electric Corporation

Claims (23)

[Claims] 1. An antenna device provided with a radiation slot on a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and an electric power feeding line feeding the radiation slot, the grounding conductor plate having the rectangular parallelepiped shape. An antenna device, characterized in that the inside is filled with a dielectric material, and the radiation slots provided perpendicularly to both ground conductor plates are fed in opposite phases. 2. The antenna device according to claim 1, wherein the dielectric material is hollowed out only between the radiating slots provided in the ground conductor plates of the specific facing vertical surfaces. 3. An antenna device provided with a radiation slot on a specific opposing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feed line for feeding the radiation slot, the antenna device being perpendicular to both ground conductor plates. An antenna device characterized in that power is supplied in opposite phases from a power feed line that electromagnetically couples a radiation slot provided toward the antenna. 4. An antenna device provided with a radiation slot on a specific opposing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feed line for feeding the radiation slot, the antenna device being perpendicular to both ground conductor plates. A plurality of radiating slots in a row toward each other, feeding the radiating slots provided on both ground conductor plates in opposite phases to each other, and feeding power to adjacent radiating slots on the same ground conductor plate. Is an integral multiple of the wavelength, and power is supplied in the same phase. 5. An antenna device provided with a radiation slot on a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feed line feeding the radiation slot, the antenna device being perpendicular to both ground conductor plates. A plurality of radiating slots in a row toward each other, feeding the radiating slots provided on both ground conductor plates in opposite phases to each other, and feeding power to adjacent radiating slots on the same ground conductor plate. Is an odd multiple of a half wavelength, and power is supplied in the same phase. 6. A pin for connecting between the facing ground conductor plates is provided in the vicinity of a radiation slot provided on a specific facing vertical surface of the ground conductor plate forming a rectangular parallelepiped shape. To the antenna device according to claim 5. 7. An antenna device comprising a ground conductor plate forming a rectangular parallelepiped and provided with radiation slots on specific facing vertical surfaces, and a feeder line for feeding the radiation slot, the antenna device comprising an upper end portion and an upper end portion of the antenna device. The trumpet-shaped conductor which spreads with a required taper angle is attached to the lower end, and the antenna device according to any one of claims 1 to 3. 8. An antenna device provided with a radiation slot on a specific facing vertical surface of a ground conductor plate forming a rectangular parallelepiped shape, and a feeder line for feeding the radiation slot, the antenna device comprising: Attaching ground conductor plates that form a semi-cylindrical shape to the outside of both vertical surfaces,
The antenna device according to any one of claims 1 to 6, wherein the influence of the diffracted wave at the end portion of the ground conductor plate provided with the radiation slot is reduced. 9. A conductor wall of a cylindrical conductor having a short-circuited termination is provided with one or a plurality of radiation slots parallel to the axis in the circumferential direction, and a conductor rod extending from the radiation slot side wall to the inside of the rectangular waveguide is provided. An antenna device for exciting the cylindrical conductor to feed the radiation slot, characterized in that a trumpet-shaped conductor that spreads at a required taper angle is attached to both ends of the cylindrical conductor. . 10. A conductor having a center-conducting short-circuited cylindrical conductor provided with one or a plurality of radiation slots parallel to the axis in the conductor wall, the conductor extending from the radiation slot side wall to the inside of the rectangular waveguide. An antenna device which is provided with a rod and excites the cylindrical conductor to feed the radiation slot, wherein trumpet-shaped conductors that spread with a required taper angle are attached to both ends of the cylindrical conductor. Antenna device. 11. An antenna device, wherein one or a plurality of radiation slots parallel to an axis are provided on a conductor wall of a cylindrical conductor having a short-circuited termination, and the cylindrical conductor is excited to feed the radiation slot. An antenna device in which the cylindrical conductor is dimensioned to be excited in the TE ₀₁ mode. 12. An antenna device, wherein a radiation slot is provided in a conductor wall of a rectangular waveguide with a short-circuited termination, and the rectangular waveguide is excited to feed the radiation slot, wherein both H surfaces of the waveguide are provided. An antenna device, wherein a plurality of radiation slots parallel to the tube axis are provided on the center line of the antenna, and conductor rods extending from the sidewalls of the radiation slots toward the inside of the rectangular waveguide are provided. 13. An antenna device in which a radiating slot is provided in a conductor wall of a rectangular waveguide with a short-circuited terminal, and the rectangular waveguide is excited to feed the radiating slot. An antenna device characterized in that a plurality of radiation slots parallel to the tube axis are provided on the center line of the, and a dielectric is provided inside the rectangular waveguide at a position asymmetric with respect to the tube axis. 14. An antenna device, wherein a radiation slot is provided in a conductor wall of a rectangular waveguide with a short-circuited termination, and the rectangular waveguide is excited to feed the radiation slot. An antenna device characterized in that a plurality of radiation slots parallel to the tube axis are provided on the center line of the antenna, and the rectangular waveguide is dimensioned to be excited in the TE ₂₀ mode. 15. A plurality of radiation slots parallel to an axis are provided in the circumferential direction on a conductor wall of a cylindrical conductor having a short-circuited terminal end having a central conductor therein, and the cylindrical conductor is excited to feed the radiation slot. An antenna device in which the central conductor has a spiral shape or a loop shape. 16. A pair of microstrip antennas having one-sided short-circuit patch conductors on a ground conductor plate are symmetrically oriented parallel to each other on both ground conductor plate surface sides, and then one of the microstrip antennas is grounded on the ground conductor plate surface. 18 keeping the direction
An antenna device characterized in that the two one-sided short-circuit patch conductors are set in a position rotated by 0 ° and fed in opposite phases to each other. 17. The ground conductor plate is bent at opposite ends thereof in mutually opposite directions, the ends of the bent portions are further folded back to form one-side short-circuit patch conductors, and the two one-side short-circuit patch conductors are fed in opposite phases to each other. An antenna device characterized by the above. 18. The antenna device according to claim 16, further comprising a non-feeding conductor having the same shape as the one-sided short-circuit patch conductor, symmetrically facing the one-sided short-circuit patch conductor on the ground conductor plate. 19. A microstrip antenna having a one-sided short-circuited patch conductor on the grounded conductor plate, with the center point of the grounded conductor plate being the center of symmetry, and another one-sided short circuit patch conductor is provided at a symmetrical position on the back surface of the ground conductor plate. , As the feed line for feeding the two patch conductors, the inner conductor of the feed line is connected to the ground conductor plate, and the outer conductor of the feed line is divided into two and connected to the two patch conductors, respectively, and the phases are opposite to each other. An antenna device characterized in that power is supplied by. 20. As a radome for protecting an omnidirectional antenna device in a horizontal plane, a conductor film is attached to the inside of the radome,
The antenna device according to any one of claims 1 to 19, wherein a plurality of radiation slots oriented in the vertical direction are provided in the circumferential direction. 21. A transponder which has an omnidirectional antenna in a horizontal plane, a radome for protecting the antenna, a transceiver, and a switch for enabling reception, and which receives and transmits radio waves. The antenna device according to any one of claims 1 to 19 is provided as the omnidirectional antenna in the horizontal plane, and means for notifying an emergency signal sender that the transponder is activated and is in a reception standby state is provided. Characteristic transponder. 22. A transponder having an in-horizontal omnidirectional antenna, a radome for protecting the antenna, and a transceiver for receiving and transmitting radio waves, wherein the in-horizontal omnidirectional antenna is claimed. 20. A transponder comprising the antenna device according to any one of claims 1 to 19, further comprising means for notifying an emergency signal sender that the transponder is activated and is in a transmitting state. 23. An omnidirectional antenna in the horizontal plane, a radome for protecting the antenna, a transceiver, and a transponder for receiving and transmitting radio waves, wherein the omnidirectional antenna in the horizontal plane is claimed. Item 20. A transponder comprising any of the antenna devices according to Item 19, further comprising means for notifying an emergency signal sender of a level at which the transponder has received a radio wave.